Home assistant reboots every few hours

Configuration
1

Hi guys!
Im running home assistant on a raspberry pi 4 4gb with few integrations:
hacs, sonoff, wiz light, broadlink and google cast.
a week ago it started rebooting every 15mins.
no errors on logs, no crash, its start normally.
i test the setup swtiching sd card, powersuply, deleted the database, etc
all the system is up to date:
*Home Assistant OS 6.2
*core-2021.8.8
*supervisor-2021.06.8
*64gb sd class a1
*passive cooling and external fan to test
*power suply ± 5A
*cpu load: no more than 3%
*memory load: 15%
*storage: 3,2 gb used
*temp: 40° with fan - 50° with heatsinks

at this moment only have automations to toogle lights (6 wiz lights) when i press rf buttons trhoug sonoff rf bridge and smart ir for turning on the tv/air cooling
tried disabling automations/integrations with no sucess.
i cant find similar post with this issue but this: HA OS reboots/crashes a few time per day... where to start to fix? - #15 by zadigre
and others saying it can be caused by google cast integration. i disabled that and then it reboot 3-4 times per day, but no sure if due to google cast
i cant see on the logs anything to share
before the rpi, home assistant was running on virtual box/windows 10 and no problem.
where do I find what is causing this?

2

As you have tested a lot of options, did you try your equipments/peripherals/SD card on another Pi ?
Do you add/change recently any equipments around the pi like a keyboard, screen or mouse ? (I am asking as I had a problem with a NUC due to the display attached to it… I spend days to figure out what the root cause of the problem was…)

3

Are you using a genuine Pi power supply? Also as @browetd said - try another SD card. Pis are notoriously fussy about power and SD card quality.

4

Start by monitoring your CPU and memory use closely.

Also look at your error logs.

Do you use the nest integration?

I beleive that was causing memory utilisation issues recently, not sure if it is fixed yet.

5

i dont have another Pi to test. also, there is no keyboards or screens connected. i tried attaching screen and mouse but its the same issue

6

i dont think its a geniune pi power supply. both power supplies used were +5 amps. The last power supply that I have left to try is from a samsung s21 ultra. will it be worth trying?
I will have to buy a new memory card type A2 to test

7

did it.
cpu: ±3%
memory: ± 15%
and yep, i use google cast to control google nest mini. I read that it could cause problems so now it’s deactivated

8

be sure to check your microSD if you use that. MicroSD can create a lot of problem for RPI4

9

The OP has done that: